| 摘要 |
PURPOSE:To increase the output by providing a duty, which does not exceed the duty at which the motor current reaches a limit level at any time, to a motor drive chopper. CONSTITUTION:A CPU(not illustrated) in a motor control circuit 1 receives data concerning to a target number of revolution, number of revolution of motor and battery voltage VB from an accelerator circuit 54, a rotation sensor 54 and a battery 60, and then respective values of the number of revolution of motor, the battery voltage VB and predetermined limit current are substituted in order to operate the duty alphaL at that time point. A duty M is then operated based on the target number of revolution and the number of revolution of motor, and a judgment is made whether alpha>=alphaL is satisfied. If alpha>=alphaL is satisfied, alphaL is substituted for alpha and outputted as the duty of a motor drive chopper 52. Consequently, the motor current IM is limited very close to the current limit. |
